The article is devoted to the memory of Lyudmila Mikhailovna Koval (October 17, 1933 – February 15, 2020), historian, Head of the History sector of the Russian State Library (RSL) and the Museum of Library history. The author presents brief biographical information about L.M. Koval, the author of more than 350 scientific and popular scientific works in Russian and in 9 foreign languages. She published 29 books in Publishing houses “Nauka”, “Kniga”, “Letniy Sad”, ”Pashkov Dom”, most of the works are dedicated to the Library. Special place in the work of L.M. Koval is given to the Great Patriotic War theme. The article considers the works devoted to the activities of Library staff during the War period. L.M. Koval paid much attention to the study of activities of the Library’s Directors. She prepared books and articles about the Directors of the Moscow Public and Rumyantsev Museums and Library from the end of the 19th century and almost to the end of the 20th century: N.V. Isakov, D.S. Levshin, V.A. Dashkov, M.A. Venevitinov, I.V. Tsvetaev, V.D. Golitsyn, A.K. Vinogradov, V.I. Nevsky, N.M. Sikorsky. The author notes contribution of L.M. Koval to the study of the Library’s history. Specialists in the history of librarianship widely use bibliography of L.M. Koval in their research. The list of sources contains the main works of L.M. Koval, and the Appendix includes reviews of publications by L.M. Koval and the works about her.
